mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-21 19:55:20 -05:00
442 lines
16 KiB
Fortran
442 lines
16 KiB
Fortran
! FILE: c_interface_module.f90
|
|
! PURPOSE: Supplement ISO-C-Binding to provide type aliases and interfaces
|
|
! to common ISO-C string functions to aid working with strings.
|
|
! AUTHOR: Joseph M. Krahn
|
|
! STATUS: Still in development. Reasonably complete, but somewhat limited testing.
|
|
!
|
|
! The idea is to provide type aliases for all ISO-C types, so that the
|
|
! Fortran interface code more explicitly defines the actual C interface.
|
|
! This should be updated to support F2008 variable-length allocatable
|
|
! strings.
|
|
!
|
|
! Entity names all have the "C_" prefix, as with ISO-C-Binding, with a
|
|
! few exceptions.
|
|
!
|
|
! Sourced from: http://fortranwiki.org/fortran/show/c_interface_module
|
|
!
|
|
! One FORALL statement reverted to a DO loop to avoid a gfortran 4.9.2 ICE
|
|
!
|
|
module C_interface_module
|
|
use, intrinsic :: ISO_C_Binding, &
|
|
! C type aliases for pointer derived types:
|
|
C_ptr => C_ptr , &
|
|
C_char_ptr => C_ptr, &
|
|
C_const_char_ptr => C_ptr, &
|
|
C_void_ptr => C_ptr, &
|
|
C_const_void_ptr => C_ptr
|
|
|
|
implicit none
|
|
public
|
|
|
|
!----------------------------------------------------------------------------
|
|
! C type aliases for intrinsic type KIND parameters:
|
|
|
|
! NOTE: a C enum may not always be a standard C int
|
|
integer, parameter :: C_enum = C_int
|
|
|
|
! Defining off_t is difficult, because it may depend on "LARGEFILE" selection.
|
|
! integer, parameter :: C_off_t = ??
|
|
|
|
! C string terminator alais using the 3-letter ASCII name.
|
|
! The C_ prefix is not used because it is just an ASCII character.
|
|
character(len=1,kind=C_char), parameter :: NUL = C_NULL_char
|
|
|
|
! NOTE: In C, "char" is distinct from "signed char", unlike integers.
|
|
! The plain "char" type is specific for text/string values, whereas
|
|
! "signed char" should indicate 1-byte integer data.
|
|
!
|
|
! Most ISO-C systems have wide chars "wchar_t", but Fortran compilers
|
|
! have limited support for different character kinds. UTF encoding
|
|
! adds more complexity. This should be updated as Fortran compilers
|
|
! include support for more character types.
|
|
!
|
|
|
|
! Fortran does not (yet) support unsigned types.
|
|
integer, parameter :: &
|
|
C_unsigned = C_int, &
|
|
C_unsigned_short = C_short, &
|
|
C_unsigned_long = C_long, &
|
|
C_unsigned_long_long = C_long_long, &
|
|
C_unsigned_char = C_signed_char, &
|
|
C_ssize_t = C_size_t, &
|
|
C_uint8_t = C_int8_t, &
|
|
C_uint16_t = C_int16_t, &
|
|
C_uint32_t = C_int32_t, &
|
|
C_uint64_t = C_int64_t, &
|
|
C_uint_least8_t = C_int_least8_t, &
|
|
C_uint_least16_t = C_int_least16_t, &
|
|
C_uint_least32_t = C_int_least32_t, &
|
|
C_uint_least64_t = C_int_least64_t, &
|
|
C_uint_fast8_t = C_int_fast8_t, &
|
|
C_uint_fast16_t = C_int_fast16_t, &
|
|
C_uint_fast32_t = C_int_fast32_t, &
|
|
C_uint_fast64_t = C_int_fast64_t, &
|
|
C_uintmax_t = C_intmax_t
|
|
! Note: ptrdiff_t cannot be reliably defined from other types.
|
|
! When practical, it is larger than a pointer because it benefits
|
|
! from the full unsigned range in both positive and negative directions.
|
|
|
|
! Integer versions including 'int', where the 'int' is optional:
|
|
integer, parameter :: &
|
|
C_short_int = C_short, &
|
|
C_long_int = C_long, &
|
|
C_long_long_int = C_long_long, &
|
|
C_unsigned_int = C_unsigned, &
|
|
C_unsigned_short_int = C_short, &
|
|
C_unsigned_long_int = C_long, &
|
|
C_unsigned_long_long_int = C_long_long
|
|
|
|
interface C_F_string
|
|
module procedure C_F_string_ptr
|
|
module procedure C_F_string_chars
|
|
end interface C_F_string
|
|
|
|
interface F_C_string
|
|
module procedure F_C_string_ptr
|
|
module procedure F_C_string_chars
|
|
end interface F_C_string
|
|
|
|
!=======================================================================
|
|
! Some useful ISO C library string functions from <string.h>
|
|
! These are based on GCC header sections marked as NAMESPACE_STD
|
|
interface
|
|
|
|
! Copy N bytes of SRC to DEST, no aliasing or overlapping allowed.
|
|
! extern void *memcpy (void *dest, const void *src, size_t n);
|
|
function C_memcpy(dest, src, n) result(result) bind(C,name="memcpy")
|
|
import C_void_ptr, C_size_t
|
|
type(C_void_ptr) :: result
|
|
type(C_void_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_void_ptr), value, intent(in) :: src ! target=intent(in)
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_memcpy
|
|
|
|
! Copy N bytes of SRC to DEST, guaranteeing correct behavior for overlapping strings.
|
|
!extern void *memmove (void *dest, const void *src, size_t n)
|
|
function C_memmove(dest, src, n) result(result) bind(C,name="memmove")
|
|
import C_void_ptr, C_size_t
|
|
type(C_void_ptr) :: result
|
|
type(C_void_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_void_ptr), value, intent(in) :: src
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_memmove
|
|
|
|
! Set N bytes of S to C.
|
|
!extern void *memset (void *s, int c, size_t n)
|
|
function C_memset(s, c, n) result(result) bind(C,name="memset")
|
|
import C_void_ptr, C_int, C_size_t
|
|
type(C_void_ptr) :: result
|
|
type(C_void_ptr), value, intent(in) :: s ! target=intent(out)
|
|
integer(C_int), value, intent(in) :: c
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_memset
|
|
|
|
! Compare N bytes of S1 and S2.
|
|
!extern int memcmp (const void *s1, const void *s2, size_t n)
|
|
pure function C_memcmp(s1, s2, n) result(result) bind(C,name="memcmp")
|
|
import C_int, C_void_ptr, C_size_t
|
|
integer(C_int) :: result
|
|
type(C_void_ptr), value, intent(in) :: s1
|
|
type(C_void_ptr), value, intent(in) :: s2
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_memcmp
|
|
|
|
! Search N bytes of S for C.
|
|
!extern void *memchr (const void *s, int c, size_t n)
|
|
pure function C_memchr(s, c, n) result(result) bind(C,name="memchr")
|
|
import C_void_ptr, C_int, C_size_t
|
|
type(C_void_ptr) :: result
|
|
type(C_void_ptr), value, intent(in) :: s
|
|
integer(C_int), value, intent(in) :: c
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_memchr
|
|
|
|
! Copy SRC to DEST.
|
|
!extern char *strcpy (char *dest, const char *src)
|
|
function C_strcpy(dest, src) result(result) bind(C,name="strcpy")
|
|
import C_char_ptr, C_size_t
|
|
type(C_char_ptr) :: result
|
|
type(C_char_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_char_ptr), value, intent(in) :: src
|
|
end function C_strcpy
|
|
|
|
! Copy no more than N characters of SRC to DEST.
|
|
!extern char *strncpy (char *dest, const char *src, size_t n)
|
|
function C_strncpy(dest, src, n) result(result) bind(C,name="strncpy")
|
|
import C_char_ptr, C_size_t
|
|
type(C_char_ptr) :: result
|
|
type(C_char_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_char_ptr), value, intent(in) :: src
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_strncpy
|
|
|
|
! Append SRC onto DEST.
|
|
!extern char *strcat (char *dest, const char *src)
|
|
function C_strcat(dest, src) result(result) bind(C,name="strcat")
|
|
import C_char_ptr, C_size_t
|
|
type(C_char_ptr) :: result
|
|
type(C_char_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_char_ptr), value, intent(in) :: src
|
|
end function C_strcat
|
|
|
|
! Append no more than N characters from SRC onto DEST.
|
|
!extern char *strncat (char *dest, const char *src, size_t n)
|
|
function C_strncat(dest, src, n) result(result) bind(C,name="strncat")
|
|
import C_char_ptr, C_size_t
|
|
type(C_char_ptr) :: result
|
|
type(C_char_ptr), value, intent(in) :: dest ! target=intent(out)
|
|
type(C_char_ptr), value, intent(in) :: src
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_strncat
|
|
|
|
! Compare S1 and S2.
|
|
!extern int strcmp (const char *s1, const char *s2)
|
|
pure function C_strcmp(s1, s2) result(result) bind(C,name="strcmp")
|
|
import C_int, C_char_ptr, C_size_t
|
|
integer(C_int) :: result
|
|
type(C_char_ptr), value, intent(in) :: s1
|
|
type(C_char_ptr), value, intent(in) :: s2
|
|
end function C_strcmp
|
|
|
|
! Compare N characters of S1 and S2.
|
|
!extern int strncmp (const char *s1, const char *s2, size_t n)
|
|
pure function C_strncmp(s1, s2, n) result(result) bind(C,name="strncmp")
|
|
import C_int, C_char_ptr, C_size_t
|
|
integer(C_int) :: result
|
|
type(C_char_ptr), value, intent(in) :: s1
|
|
type(C_char_ptr), value, intent(in) :: s2
|
|
integer(C_size_t), value, intent(in) :: n
|
|
end function C_strncmp
|
|
|
|
! Return the length of S.
|
|
!extern size_t strlen (const char *s)
|
|
pure function C_strlen(s) result(result) bind(C,name="strlen")
|
|
import C_char_ptr, C_size_t
|
|
integer(C_size_t) :: result
|
|
type(C_char_ptr), value, intent(in) :: s !character(len=*), intent(in)
|
|
end function C_strlen
|
|
|
|
end interface
|
|
|
|
! End of <string.h>
|
|
!=========================================================================
|
|
! Standard ISO-C malloc routines:
|
|
interface
|
|
|
|
! void *calloc(size_t nmemb, size_t size);
|
|
type(C_void_ptr) function C_calloc(nmemb, size) bind(C,name="calloc")
|
|
import C_void_ptr, C_size_t
|
|
integer(C_size_t), value, intent(in) :: nmemb, size
|
|
end function C_calloc
|
|
|
|
! void *malloc(size_t size);
|
|
type(C_void_ptr) function C_malloc(size) bind(C,name="malloc")
|
|
import C_void_ptr, C_size_t
|
|
integer(C_size_t), value, intent(in) :: size
|
|
end function C_malloc
|
|
|
|
! void free(void *ptr);
|
|
subroutine C_free(ptr) bind(C,name="free")
|
|
import C_void_ptr
|
|
type(C_void_ptr), value, intent(in) :: ptr
|
|
end subroutine C_free
|
|
|
|
! void *realloc(void *ptr, size_t size);
|
|
type(C_void_ptr) function C_realloc(ptr,size) bind(C,name="realloc")
|
|
import C_void_ptr, C_size_t
|
|
type(C_void_ptr), value, intent(in) :: ptr
|
|
integer(C_size_t), value, intent(in) :: size
|
|
end function C_realloc
|
|
|
|
end interface
|
|
|
|
interface assignment(=)
|
|
module procedure F_string_assign_C_string
|
|
end interface assignment(=)
|
|
|
|
!==========================================================================
|
|
|
|
contains
|
|
|
|
! HACK: For some reason, C_associated was not defined as pure.
|
|
pure logical function C_associated_pure(ptr) result(associated)
|
|
type(C_ptr), intent(in) :: ptr
|
|
integer(C_intptr_t) :: iptr
|
|
iptr = transfer(ptr,iptr)
|
|
associated = (iptr /= 0)
|
|
end function C_associated_pure
|
|
|
|
! Set a fixed-length Fortran string to the value of a C string.
|
|
subroutine F_string_assign_C_string(F_string, C_string)
|
|
character(len=*), intent(out) :: F_string
|
|
type(C_ptr), intent(in) :: C_string
|
|
character(len=1,kind=C_char), pointer :: p_chars(:)
|
|
integer :: i
|
|
if (.not. C_associated(C_string) ) then
|
|
F_string = ' '
|
|
else
|
|
call C_F_pointer(C_string,p_chars,[huge(0)])
|
|
i=1
|
|
do while(p_chars(i)/=NUL .and. i<=len(F_string))
|
|
F_string(i:i) = p_chars(i)
|
|
i=i+1
|
|
end do
|
|
if (i<len(F_string)) F_string(i:) = ' '
|
|
end if
|
|
end subroutine F_string_assign_C_string
|
|
|
|
! Copy a C string, passed by pointer, to a Fortran string.
|
|
! If the C pointer is NULL, the Fortran string is blanked.
|
|
! C_string must be NUL terminated, or at least as long as F_string.
|
|
! If C_string is longer, it is truncated. Otherwise, F_string is
|
|
! blank-padded at the end.
|
|
subroutine C_F_string_ptr(C_string, F_string)
|
|
type(C_ptr), intent(in) :: C_string
|
|
character(len=*), intent(out) :: F_string
|
|
character(len=1,kind=C_char), dimension(:), pointer :: p_chars
|
|
integer :: i
|
|
if (.not. C_associated(C_string)) then
|
|
F_string = ' '
|
|
else
|
|
call C_F_pointer(C_string,p_chars,[huge(0)])
|
|
i=1
|
|
do while(p_chars(i)/=NUL .and. i<=len(F_string))
|
|
F_string(i:i) = p_chars(i)
|
|
i=i+1
|
|
end do
|
|
if (i<len(F_string)) F_string(i:) = ' '
|
|
end if
|
|
end subroutine C_F_string_ptr
|
|
|
|
! Copy a C string, passed as a char-array reference, to a Fortran string.
|
|
subroutine C_F_string_chars(C_string, F_string)
|
|
character(len=1,kind=C_char), intent(in) :: C_string(*)
|
|
character(len=*), intent(out) :: F_string
|
|
integer :: i
|
|
i=1
|
|
do while(C_string(i)/=NUL .and. i<=len(F_string))
|
|
F_string(i:i) = C_string(i)
|
|
i=i+1
|
|
end do
|
|
if (i<len(F_string)) F_string(i:) = ' '
|
|
end subroutine C_F_string_chars
|
|
|
|
! Copy a Fortran string to an allocated C string pointer.
|
|
! If the C pointer is NULL, no action is taken. (Maybe auto allocate via libc call?)
|
|
! If the length is not passed, the C string must be at least: len(F_string)+1
|
|
! If the length is passed and F_string is too long, it is truncated.
|
|
subroutine F_C_string_ptr(F_string, C_string, C_string_len)
|
|
character(len=*), intent(in) :: F_string
|
|
type(C_ptr), intent(in) :: C_string ! target = intent(out)
|
|
integer, intent(in), optional :: C_string_len ! Max string length,
|
|
! INCLUDING THE TERMINAL NUL
|
|
character(len=1,kind=C_char), dimension(:), pointer :: p_chars
|
|
integer :: i, strlen
|
|
strlen = len(F_string)
|
|
if (present(C_string_len)) then
|
|
if (C_string_len <= 0) return
|
|
strlen = min(strlen,C_string_len)
|
|
end if
|
|
if (.not. C_associated(C_string)) then
|
|
return
|
|
end if
|
|
call C_F_pointer(C_string,p_chars,[strlen+1])
|
|
forall (i=1:strlen)
|
|
p_chars(i) = F_string(i:i)
|
|
end forall
|
|
p_chars(strlen+1) = NUL
|
|
end subroutine F_C_string_ptr
|
|
|
|
pure function C_strlen_safe(s) result(length)
|
|
integer(C_size_t) :: length
|
|
type(C_char_ptr), value, intent(in) :: s
|
|
if (.not. C_associated_pure(s)) then
|
|
length = 0
|
|
else
|
|
length = C_strlen(s)
|
|
end if
|
|
end function C_strlen_safe
|
|
|
|
function C_string_value(C_string) result(F_string)
|
|
type(C_ptr), intent(in) :: C_string
|
|
character(len=C_strlen_safe(C_string)) :: F_string
|
|
character(len=1,kind=C_char), dimension(:), pointer :: p_chars
|
|
integer :: i, length
|
|
length = len(F_string)
|
|
if (length/=0) then
|
|
call C_F_pointer(C_string,p_chars,[length])
|
|
forall (i=1:length)
|
|
F_string(i:i) = p_chars(i)
|
|
end forall
|
|
end if
|
|
end function C_string_value
|
|
|
|
! Copy a Fortran string to a C string passed by char-array reference.
|
|
! If the length is not passed, the C string must be at least: len(F_string)+1
|
|
! If the length is passed and F_string is too long, it is truncated.
|
|
subroutine F_C_string_chars(F_string, C_string, C_string_len)
|
|
character(len=*), intent(in) :: F_string
|
|
character(len=1,kind=C_char), dimension(*), intent(out) :: C_string
|
|
integer, intent(in), optional :: C_string_len ! Max string length,
|
|
! INCLUDING THE TERMINAL NUL
|
|
integer :: i, strlen
|
|
strlen = len(F_string)
|
|
if (present(C_string_len)) then
|
|
if (C_string_len <= 0) return
|
|
strlen = min(strlen,C_string_len)
|
|
end if
|
|
forall (i=1:strlen)
|
|
C_string(i) = F_string(i:i)
|
|
end forall
|
|
C_string(strlen+1) = NUL
|
|
end subroutine F_C_string_chars
|
|
|
|
! NOTE: Strings allocated here must be freed by the
|
|
! C library, such as via C_free() or C_string_free(),
|
|
type(C_ptr) function F_C_string_dup(F_string,length) result(C_string)
|
|
character(len=*), intent(in) :: F_string
|
|
integer, intent(in), optional :: length
|
|
character(len=1,kind=C_char), pointer :: C_string_ptr(:)
|
|
integer :: i
|
|
integer(C_size_t) :: strlen
|
|
if (present(length)) then
|
|
strlen = length
|
|
else
|
|
strlen = len(F_string)
|
|
end if
|
|
if (strlen <= 0) then
|
|
C_string = C_NULL_ptr
|
|
else
|
|
C_string = C_malloc(strlen+1)
|
|
if (C_associated(C_string)) then
|
|
call C_F_pointer(C_string,C_string_ptr,[strlen+1])
|
|
forall (i=1:strlen)
|
|
C_string_ptr(i) = F_string(i:i)
|
|
end forall
|
|
C_string_ptr(strlen+1) = NUL
|
|
end if
|
|
end if
|
|
end function F_C_string_dup
|
|
|
|
! NOTE: Strings allocated here must be freed by the
|
|
! C library, such as via C_free() or C_string_free(),
|
|
type(C_ptr) function C_string_alloc(length) result(C_string)
|
|
integer(C_size_t), intent(in) :: length
|
|
character(len=1,kind=C_char), pointer :: C_charptr
|
|
C_string = C_malloc(length+1)
|
|
if (C_associated(C_string)) then
|
|
call C_F_pointer(C_string,C_charptr)
|
|
C_charptr = NUL
|
|
end if
|
|
end function C_string_alloc
|
|
|
|
subroutine C_string_free(string)
|
|
type(C_ptr), intent(inout) :: string
|
|
if (C_associated(string)) then
|
|
call C_free(string)
|
|
string = C_NULL_ptr
|
|
end if
|
|
end subroutine C_string_free
|
|
|
|
end module C_interface_module
|